PGXC_LOCK_CONFLICTS
PGXC_LOCK_CONFLICTS displays information about conflicting locks in the cluster.
When a lock is waiting for another lock or another lock is waiting for this one, a lock conflict occurs.
Currently, PGXC_LOCK_CONFLICTS collects only information about locks whose locktype is relation, partition, page, tuple, or transactionid.
| Column | Type | Description |
|---|---|---|
| locktype | Text | Type of the locked object |
| nodename | Name | Name of the node where the locked object resides |
| dbname | Name | Name of the database where the locked object resides. The value is NULL if the locked object is a transaction. |
| nspname | Name | Name of the namespace of the locked object |
| relname | Name | Name of the relation targeted by the lock. The value is NULL if the object is not a relation or part of a relation. |
| partname | Name | Name of the partition targeted by the lock. The value is NULL if the locked object is not a partition. |
| page | Integer | Number of the page targeted by the lock. The value is NULL if the locked object is neither a page nor a tuple. |
| tuple | Smallint | Number of the tuple targeted by the lock. The value is NULL if the locked object is not a tuple. |
| transactionid | Xid | ID of the transaction targeted by the lock. The value is NULL if the locked object is not a transaction. |
| username | Name | Name of the user who applies for the lock |
| gxid | Xid | ID of the transaction that applies for the lock |
| xactstart | Timestamp with time zone | Start time of the transaction that applies for the lock |
| queryid | Bigint | Latest query ID of the thread that applies for the lock |
| query | Text | Latest query statement of the thread that applies for the lock |
| pid | Bigint | ID of the thread that applies for the lock |
| mode | Text | Lock mode |
| granted | Boolean |
|
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